backend.py 文件源码

def _get_code_from_exception(backend, operation, e):
    if isinstance(e, BackendException) and e.code != log.ErrorCode.backend_error:
        return e.code
    elif hasattr(backend, '_error_code'):
        return backend._error_code(operation, e) or log.ErrorCode.backend_error
    elif hasattr(e, 'errno'):
        # A few backends return such errors (local, paramiko, etc)
        if e.errno == errno.EACCES:
            return log.ErrorCode.backend_permission_denied
        elif e.errno == errno.ENOENT:
            return log.ErrorCode.backend_not_found
        elif e.errno == errno.ENOSPC:
            return log.ErrorCode.backend_no_space
    return log.ErrorCode.backend_error